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13. Cellulose nanofiber and halloysite nanotubes embedded polyvinyl alcohol membranes for pervaporation dehydration of epichlorohydrin–isopropanol–water ternary feed mixture.

Author

Chaudhari, Shivshanakar, Yeo, SangJun, Shin, HyeonTae, Kim, UiSeo, Jo, Sewook, Cho, Kie Yong, Shon, MinYoung, Nam, SeungEun, and Park, YouIn

Subjects
PERVAPORATION, ISOPROPYL alcohol, POLYVINYL alcohol, HALLOYSITE, FIELD emission electron microscopy, CELLULOSE, NANOTUBES
Abstract

The dehydration of epichlorohydrin (ECH)–isopropanol (IPA)–water mixtures was conducted by using pervaporation separation process. Two types of crosslinked polyvinyl alcohol (PVA) membranes, PVA‐Glu and PVA‐TEOS, were prepared using glutaraldehyde (Glu) and tetraethyl ortho silicate (TEOS), then mixed with cellulose nanofiber (CNF) and halloysite nanotube (HNT) fillers, respectively. They characterized using field emission scanning electron microscopy to observe surface morphology, Fourier‐transform infrared spectroscopy to study the filler–polymer interactions and chemistries of membranes, and X‐ray diffraction experiment for the analysis of membrane crystallinity. Finally, a pervaporation test was carried out to dehydrate the ECH–IPA–water feed solution at the azeotropic feed composition. From the result, the membrane of PVA‐Glu, including 4% w/w CNF filler, showed a flux of 0.17 kg (m2h)−1 and a separation factor of 456. However, the membrane of PVA‐TEOS with 5% w/w HNTs filler indicated a flux of 0.15 kg (m2h)−1 and a separation factor of 4158. The higher pervaporation performance of the HNTs‐added PVA‐TEOS membrane is attributed to the smaller size and more porous nature of HNTs than CNFs. [ABSTRACT FROM AUTHOR]

Published
2023
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25. In Situ Generation of Silver Nanoparticles in Poly(Vinyl Alcohol)/Poly(Acrylic Acid) Polymer Membranes in the Absence of Reducing Agent and their Effect on Pervaporation of a Water/Acetic Acid Mixture.

Author

Chaudhari, Shivshankar, Kwon, YongSung, Moon, MyungJun, Shon, MinYoung, Nam, SeungEun, and Park, YouIn

Subjects
SILVER nanoparticles, POLYVINYL alcohol, POLYMERIC membranes, REDUCING agents, PERVAPORATION, MIXTURES, WATER, ACETIC acid
Abstract

The in situ generation of silver nanoparticles in a poly(vinyl alcohol)/poly(acrylic acid) ( PVA/ PAA) polymer matrix in the absence of any additional reducing agent is reported and tends to the membrane fabrication using solution-casting. Its effect on the separation of a water/acetic acid mixture by pervaporation is described. The results of UV spectroscopy, scanning electron microscopy, and scanning electron microscopy/energy-dispersive X-ray spectroscopy analyses showed that the silver nanoparticles were successfully prepared and well dispersed in the polymer matrix. The increased hydrophilicity of the PVA/ PAA membrane due to the presence of silver nanoparticles was confirmed by Fourier transform infrared spectroscopy, contact angle measurements, and membrane absorption studies. Pervaporation data for composite membranes showed a three-fold increase in the flux value, while the initially decreased separation factor subsequently showed a constant value. Overall, the pervaporation data suggested that the presence of silver nanoparticles benefited the dehydration process. [ABSTRACT FROM AUTHOR]

Published
2016
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